SMALLTALK

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SMALLTALK

• Presented By
• Kameron Ethridge
• Sheree Martin
• Cassandra Void
• Michael Williams

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• THE HISTORY OF SMALLTALK

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History

• Smalltalk roots reach back to the early
  seventies when many ideas were first explored in
  the context of the Dynabook project at the Xerox
  Palo Alto Research Center.
• Developed by Alan Klay on October 1972.
• Smalltalk was initially envisioned as a simple
  language suitable to be used by children who did
  not have any prior computer knowledge.
• Smalltalk is generally recognized as the second
  Object Programming Language and the first true
  Integrated Development Environment (IDE).

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History

• The first Smalltalk system contained 1000 lines
  of code which computed 3 4.
• The next version of Smalltalk was called
  Smalltalk 72, which was implemented in assembly
  code.
• Smalltalk 72 was used to teach object-oriented
  Programming (OOP) to high school students.

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History

• From there came Smalltalk 74 and Smalltalk 76
  80.
• Newer versions now have the capability to provide
  better graphics and information retrieved.

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• In essence, Smalltalk is a programming language
  focused on human beings rather than the
  computer.
• -Alan Knight

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Comparison with other languages
Smalltalk 80 C Java
Typing Dynamic Static Static
Inheritance Single Multiple Single
Private methods No Yes Yes
Templates Not needed Yes No
Garbage collection Yes No Yes
Class variables Yes Yes Yes
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Significant Language Features

• Object-Oriented - Smalltalk is a language in
  which reusable objects exchange messages.
• Graphical Programming Environment - First look at
  cut/copy/paste in programming language for most
  people.
• Versatile - Has many applications and uses.
• Graphic primitives and drawing programs -
  Supports quickly and easily created graphics.

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New Language Concepts

• Syntax is very similar to natural language
• Syntax pattern is always object then verb
• Three basic linguistic constructs
• Hello World as Uppercase UNARY CASE
• 1 2 BINARY CASE
• Hello World beginsWith Hello
• NAMED PARAMETERS

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• EXAMPLES
• OF
• USAGE

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Smalltalk In Use

• Airline and Travel
• Some airlines web-based user interface is written
  in Smalltalk
• Manufacturing and Engineering
• ControlWORKS is written in VisualWorks Smalltalk.
• Government
• Recovering delinquent taxes using Smalltalk in
  Cincoms Object Studio

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Pocket Smalltalk

• Pocket Smalltalk IDE is a free open source
  programming environment that lets developers
  write Smalltalk applications for Palm Powered
  handhelds, and other small devices.
• Pocket Smalltalk consists of an integrated
  development environment (IDE) which runs on a
  variety of platforms (Windows, MacOS, Linux,
  OS/2, others). It includes a cross-compiler that
  can generate PalmOS "executable" (.PRC) files
  from Smalltalk source code.
•  
• Pocket Smalltalk makes it easy to do
  object-oriented development for Palm Powered
  handhelds. You have the full power of Smalltalk
  along with a complete class library. Best of all,
  Pocket Smalltalk creates small, standalone
  applications no runtime libraries are required.

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Smalltalk Future Focus

• IBM VisualAge Smalltalk Enterprise V6.0 is now
  available.
• Allows programmers to create and deploy
  e-business applications
• Includes XML Schema Support
• Smalltalk is well-supported by IBM and many other
  vendors

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Bibliography

• http//www.whysmalltalk.com/quotes
• http//www.ipa.net/dwighth/smalltalk/byte_aug81/d
  esign-principles-behind-smalltalk.html
• http//www.cs.rit.edu/jsf7949/intro.html
• http//www.pocketsmalltalk.com/